JVM 字节码解释执行：
hotspot/src/share/vm/interpreter/bytecodeInterpreter.cpp
bytecodeInterpreter.cpp
run:
DO_UPDATE_INSTRUCTION_COUNT(*pc)
DEBUGGER_SINGLE_STEP_NOTIFY();
#ifdef PREFETCH_OPCCODE
opcode = *pc; /* prefetch first opcode */
#endif
#ifndef USELABELS
while (1)
#endif
{
#ifndef PREFETCH_OPCCODE
opcode = *pc;
#endif
// Seems like this happens twice per opcode. At worst this is only
// need at entry to the loop.
// DEBUGGER_SINGLE_STEP_NOTIFY();
/* Using this labels avoids double breakpoints when quickening and
* when returing from transition frames.
*/
opcode_switch:
assert(istate == orig, "Corrupted istate");
/* QQQ Hmm this has knowledge of direction, ought to be a stack method */
assert(topOfStack >= istate->stack_limit(), "Stack overrun");
assert(topOfStack < istate->stack_base(), "Stack underrun");
#ifdef USELABELS
DISPATCH(opcode);
#else
switch (opcode)
#endif
{
CASE(_nop):
UPDATE_PC_AND_CONTINUE(1);
/* Push miscellaneous constants onto the stack. */
CASE(_aconst_null):
SET_STACK_OBJECT(NULL, 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
#undef OPC_CONST_n
#define OPC_CONST_n(opcode, const_type, value) \
CASE(opcode): \
SET_STACK_ ## const_type(value, 0); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
OPC_CONST_n(_iconst_m1, INT, -1);
OPC_CONST_n(_iconst_0, INT, 0);
OPC_CONST_n(_iconst_1, INT, 1);
OPC_CONST_n(_iconst_2, INT, 2);
OPC_CONST_n(_iconst_3, INT, 3);
OPC_CONST_n(_iconst_4, INT, 4);
OPC_CONST_n(_iconst_5, INT, 5);
OPC_CONST_n(_fconst_0, FLOAT, 0.0);
OPC_CONST_n(_fconst_1, FLOAT, 1.0);
OPC_CONST_n(_fconst_2, FLOAT, 2.0);
#undef OPC_CONST2_n
#define OPC_CONST2_n(opcname, value, key, kind) \
CASE(_##opcname): \
{ \
SET_STACK_ ## kind(VM##key##Const##value(), 1); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 2); \
}
OPC_CONST2_n(dconst_0, Zero, double, DOUBLE);
OPC_CONST2_n(dconst_1, One, double, DOUBLE);
OPC_CONST2_n(lconst_0, Zero, long, LONG);
OPC_CONST2_n(lconst_1, One, long, LONG);
/* Load constant from constant pool: */
/* Push a 1-byte signed integer value onto the stack. */
CASE(_bipush):
SET_STACK_INT((jbyte)(pc[1]), 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(2, 1);
/* Push a 2-byte signed integer constant onto the stack. */
CASE(_sipush):
SET_STACK_INT((int16_t)Bytes::get_Java_u2(pc + 1), 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(3, 1);
/* load from local variable */
CASE(_aload):
VERIFY_OOP(LOCALS_OBJECT(pc[1]));
SET_STACK_OBJECT(LOCALS_OBJECT(pc[1]), 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(2, 1);
CASE(_iload):
CASE(_fload):
SET_STACK_SLOT(LOCALS_SLOT(pc[1]), 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(2, 1);
CASE(_lload):
SET_STACK_LONG_FROM_ADDR(LOCALS_LONG_AT(pc[1]), 1);
UPDATE_PC_AND_TOS_AND_CONTINUE(2, 2);
CASE(_dload):
SET_STACK_DOUBLE_FROM_ADDR(LOCALS_DOUBLE_AT(pc[1]), 1);
UPDATE_PC_AND_TOS_AND_CONTINUE(2, 2);
#undef OPC_LOAD_n
#define OPC_LOAD_n(num) \
CASE(_aload_##num): \
VERIFY_OOP(LOCALS_OBJECT(num)); \
SET_STACK_OBJECT(LOCALS_OBJECT(num), 0); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1); \
\
CASE(_iload_##num): \
CASE(_fload_##num): \
SET_STACK_SLOT(LOCALS_SLOT(num), 0); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1); \
\
CASE(_lload_##num): \
SET_STACK_LONG_FROM_ADDR(LOCALS_LONG_AT(num), 1); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 2); \
CASE(_dload_##num): \
SET_STACK_DOUBLE_FROM_ADDR(LOCALS_DOUBLE_AT(num), 1); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 2);
OPC_LOAD_n(0);
OPC_LOAD_n(1);
OPC_LOAD_n(2);
OPC_LOAD_n(3);
/* store to a local variable */
CASE(_astore):
astore(topOfStack, -1, locals, pc[1]);
UPDATE_PC_AND_TOS_AND_CONTINUE(2, -1);
CASE(_istore):
CASE(_fstore):
SET_LOCALS_SLOT(STACK_SLOT(-1), pc[1]);
UPDATE_PC_AND_TOS_AND_CONTINUE(2, -1);
CASE(_lstore):
SET_LOCALS_LONG(STACK_LONG(-1), pc[1]);
UPDATE_PC_AND_TOS_AND_CONTINUE(2, -2);
CASE(_dstore):
SET_LOCALS_DOUBLE(STACK_DOUBLE(-1), pc[1]);
UPDATE_PC_AND_TOS_AND_CONTINUE(2, -2);
CASE(_wide): {
uint16_t reg = Bytes::get_Java_u2(pc + 2);
opcode = pc[1];
switch(opcode) {
case Bytecodes::_aload:
VERIFY_OOP(LOCALS_OBJECT(reg));
SET_STACK_OBJECT(LOCALS_OBJECT(reg), 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(4, 1);
case Bytecodes::_iload:
case Bytecodes::_fload:
SET_STACK_SLOT(LOCALS_SLOT(reg), 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(4, 1);
case Bytecodes::_lload:
SET_STACK_LONG_FROM_ADDR(LOCALS_LONG_AT(reg), 1);
UPDATE_PC_AND_TOS_AND_CONTINUE(4, 2);
case Bytecodes::_dload:
SET_STACK_DOUBLE_FROM_ADDR(LOCALS_LONG_AT(reg), 1);
UPDATE_PC_AND_TOS_AND_CONTINUE(4, 2);
case Bytecodes::_astore:
astore(topOfStack, -1, locals, reg);
UPDATE_PC_AND_TOS_AND_CONTINUE(4, -1);
case Bytecodes::_istore:
case Bytecodes::_fstore:
SET_LOCALS_SLOT(STACK_SLOT(-1), reg);
UPDATE_PC_AND_TOS_AND_CONTINUE(4, -1);
case Bytecodes::_lstore:
SET_LOCALS_LONG(STACK_LONG(-1), reg);
UPDATE_PC_AND_TOS_AND_CONTINUE(4, -2);
case Bytecodes::_dstore:
SET_LOCALS_DOUBLE(STACK_DOUBLE(-1), reg);
UPDATE_PC_AND_TOS_AND_CONTINUE(4, -2);
case Bytecodes::_iinc: {
int16_t offset = (int16_t)Bytes::get_Java_u2(pc+4);
// Be nice to see what this generates.... QQQ
SET_LOCALS_INT(LOCALS_INT(reg) + offset, reg);
UPDATE_PC_AND_CONTINUE(6);
}
case Bytecodes::_ret:
pc = istate->method()->code_base() + (intptr_t)(LOCALS_ADDR(reg));
UPDATE_PC_AND_CONTINUE(0);
default:
VM_JAVA_ERROR(vmSymbols::java_lang_InternalError(), "undefined opcode");
}
}
#undef OPC_STORE_n
#define OPC_STORE_n(num) \
CASE(_astore_##num): \
astore(topOfStack, -1, locals, num); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -1); \
CASE(_istore_##num): \
CASE(_fstore_##num): \
SET_LOCALS_SLOT(STACK_SLOT(-1), num); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -1);
OPC_STORE_n(0);
OPC_STORE_n(1);
OPC_STORE_n(2);
OPC_STORE_n(3);
#undef OPC_DSTORE_n
#define OPC_DSTORE_n(num) \
CASE(_dstore_##num): \
SET_LOCALS_DOUBLE(STACK_DOUBLE(-1), num); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -2); \
CASE(_lstore_##num): \
SET_LOCALS_LONG(STACK_LONG(-1), num); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -2);
OPC_DSTORE_n(0);
OPC_DSTORE_n(1);
OPC_DSTORE_n(2);
OPC_DSTORE_n(3);
/* stack pop, dup, and insert opcodes */
CASE(_pop): /* Discard the top item on the stack */
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -1);
CASE(_pop2): /* Discard the top 2 items on the stack */
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -2);
CASE(_dup): /* Duplicate the top item on the stack */
dup(topOfStack);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
CASE(_dup2): /* Duplicate the top 2 items on the stack */
dup2(topOfStack);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 2);
CASE(_dup_x1): /* insert top word two down */
dup_x1(topOfStack);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
CASE(_dup_x2): /* insert top word three down */
dup_x2(topOfStack);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
CASE(_dup2_x1): /* insert top 2 slots three down */
dup2_x1(topOfStack);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 2);
CASE(_dup2_x2): /* insert top 2 slots four down */
dup2_x2(topOfStack);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 2);
CASE(_swap): { /* swap top two elements on the stack */
swap(topOfStack);
UPDATE_PC_AND_CONTINUE(1);
}
/* Perform various binary integer operations */
#undef OPC_INT_BINARY
#define OPC_INT_BINARY(opcname, opname, test) \
CASE(_i##opcname): \
if (test && (STACK_INT(-1) == 0)) { \
VM_JAVA_ERROR(vmSymbols::java_lang_ArithmeticException(), \
"/ by zero"); \
} \
SET_STACK_INT(VMint##opname(STACK_INT(-2), \
STACK_INT(-1)), \
-2); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -1); \
CASE(_l##opcname): \
{ \
if (test) { \
jlong l1 = STACK_LONG(-1); \
if (VMlongEqz(l1)) { \
VM_JAVA_ERROR(vmSymbols::java_lang_ArithmeticException(), \
"/ by long zero"); \
} \
} \
/* First long at (-1,-2) next long at (-3,-4) */ \
SET_STACK_LONG(VMlong##opname(STACK_LONG(-3), \
STACK_LONG(-1)), \
-3); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -2); \
}
OPC_INT_BINARY(add, Add, 0);
OPC_INT_BINARY(sub, Sub, 0);
OPC_INT_BINARY(mul, Mul, 0);
OPC_INT_BINARY(and, And, 0);
OPC_INT_BINARY(or, Or, 0);
OPC_INT_BINARY(xor, Xor, 0);
OPC_INT_BINARY(div, Div, 1);
OPC_INT_BINARY(rem, Rem, 1);
/* Perform various binary floating number operations */
/* On some machine/platforms/compilers div zero check can be implicit */
#undef OPC_FLOAT_BINARY
#define OPC_FLOAT_BINARY(opcname, opname) \
CASE(_d##opcname): { \
SET_STACK_DOUBLE(VMdouble##opname(STACK_DOUBLE(-3), \
STACK_DOUBLE(-1)), \
-3); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -2); \
} \
CASE(_f##opcname): \
SET_STACK_FLOAT(VMfloat##opname(STACK_FLOAT(-2), \
STACK_FLOAT(-1)), \
-2); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -1);
OPC_FLOAT_BINARY(add, Add);
OPC_FLOAT_BINARY(sub, Sub);
OPC_FLOAT_BINARY(mul, Mul);
OPC_FLOAT_BINARY(div, Div);
OPC_FLOAT_BINARY(rem, Rem);
/* Shift operations
* Shift left int and long: ishl, lshl
* Logical shift right int and long w/zero extension: iushr, lushr
* Arithmetic shift right int and long w/sign extension: ishr, lshr
*/
#undef OPC_SHIFT_BINARY
#define OPC_SHIFT_BINARY(opcname, opname) \
CASE(_i##opcname): \
SET_STACK_INT(VMint##opname(STACK_INT(-2), \
STACK_INT(-1)), \
-2); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -1); \
CASE(_l##opcname): \
{ \
SET_STACK_LONG(VMlong##opname(STACK_LONG(-2), \
STACK_INT(-1)), \
-2); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -1); \
}
OPC_SHIFT_BINARY(shl, Shl);
OPC_SHIFT_BINARY(shr, Shr);
OPC_SHIFT_BINARY(ushr, Ushr);
/* Increment local variable by constant */
CASE(_iinc):
{
// locals[pc[1]].j.i += (jbyte)(pc[2]);
SET_LOCALS_INT(LOCALS_INT(pc[1]) + (jbyte)(pc[2]), pc[1]);
UPDATE_PC_AND_CONTINUE(3);
}
/* negate the value on the top of the stack */
CASE(_ineg):
SET_STACK_INT(VMintNeg(STACK_INT(-1)), -1);
UPDATE_PC_AND_CONTINUE(1);
CASE(_fneg):
SET_STACK_FLOAT(VMfloatNeg(STACK_FLOAT(-1)), -1);
UPDATE_PC_AND_CONTINUE(1);
CASE(_lneg):
{
SET_STACK_LONG(VMlongNeg(STACK_LONG(-1)), -1);
UPDATE_PC_AND_CONTINUE(1);
}
CASE(_dneg):
{
SET_STACK_DOUBLE(VMdoubleNeg(STACK_DOUBLE(-1)), -1);
UPDATE_PC_AND_CONTINUE(1);
}
/* Conversion operations */
CASE(_i2f): /* convert top of stack int to float */
SET_STACK_FLOAT(VMint2Float(STACK_INT(-1)), -1);
UPDATE_PC_AND_CONTINUE(1);
CASE(_i2l): /* convert top of stack int to long */
{
// this is ugly QQQ
jlong r = VMint2Long(STACK_INT(-1));
MORE_STACK(-1); // Pop
SET_STACK_LONG(r, 1);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 2);
}
CASE(_i2d): /* convert top of stack int to double */
{
// this is ugly QQQ (why cast to jlong?? )
jdouble r = (jlong)STACK_INT(-1);
MORE_STACK(-1); // Pop
SET_STACK_DOUBLE(r, 1);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 2);
}
CASE(_l2i): /* convert top of stack long to int */
{
jint r = VMlong2Int(STACK_LONG(-1));
MORE_STACK(-2); // Pop
SET_STACK_INT(r, 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
}
CASE(_l2f): /* convert top of stack long to float */
{
jlong r = STACK_LONG(-1);
MORE_STACK(-2); // Pop
SET_STACK_FLOAT(VMlong2Float(r), 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
}
CASE(_l2d): /* convert top of stack long to double */
{
jlong r = STACK_LONG(-1);
MORE_STACK(-2); // Pop
SET_STACK_DOUBLE(VMlong2Double(r), 1);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 2);
}
CASE(_f2i): /* Convert top of stack float to int */
SET_STACK_INT(SharedRuntime::f2i(STACK_FLOAT(-1)), -1);
UPDATE_PC_AND_CONTINUE(1);
CASE(_f2l): /* convert top of stack float to long */
{
jlong r = SharedRuntime::f2l(STACK_FLOAT(-1));
MORE_STACK(-1); // POP
SET_STACK_LONG(r, 1);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 2);
}
CASE(_f2d): /* convert top of stack float to double */
{
jfloat f;
jdouble r;
f = STACK_FLOAT(-1);
r = (jdouble) f;
MORE_STACK(-1); // POP
SET_STACK_DOUBLE(r, 1);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 2);
}
CASE(_d2i): /* convert top of stack double to int */
{
jint r1 = SharedRuntime::d2i(STACK_DOUBLE(-1));
MORE_STACK(-2);
SET_STACK_INT(r1, 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
}
CASE(_d2f): /* convert top of stack double to float */
{
jfloat r1 = VMdouble2Float(STACK_DOUBLE(-1));
MORE_STACK(-2);
SET_STACK_FLOAT(r1, 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
}
CASE(_d2l): /* convert top of stack double to long */
{
jlong r1 = SharedRuntime::d2l(STACK_DOUBLE(-1));
MORE_STACK(-2);
SET_STACK_LONG(r1, 1);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 2);
}
CASE(_i2b):
SET_STACK_INT(VMint2Byte(STACK_INT(-1)), -1);
UPDATE_PC_AND_CONTINUE(1);
CASE(_i2c):
SET_STACK_INT(VMint2Char(STACK_INT(-1)), -1);
UPDATE_PC_AND_CONTINUE(1);
CASE(_i2s):
SET_STACK_INT(VMint2Short(STACK_INT(-1)), -1);
UPDATE_PC_AND_CONTINUE(1);
/* comparison operators */
#define COMPARISON_OP(name, comparison) \
CASE(_if_icmp##name): { \
int skip = (STACK_INT(-2) comparison STACK_INT(-1)) \
? (int16_t)Bytes::get_Java_u2(pc + 1) : 3; \
address branch_pc = pc; \
UPDATE_PC_AND_TOS(skip, -2); \
DO_BACKEDGE_CHECKS(skip, branch_pc); \
CONTINUE; \
} \
CASE(_if##name): { \
int skip = (STACK_INT(-1) comparison 0) \
? (int16_t)Bytes::get_Java_u2(pc + 1) : 3; \
address branch_pc = pc; \
UPDATE_PC_AND_TOS(skip, -1); \
DO_BACKEDGE_CHECKS(skip, branch_pc); \
CONTINUE; \
}
#define COMPARISON_OP2(name, comparison) \
COMPARISON_OP(name, comparison) \
CASE(_if_acmp##name): { \
int skip = (STACK_OBJECT(-2) comparison STACK_OBJECT(-1)) \
? (int16_t)Bytes::get_Java_u2(pc + 1) : 3; \
address branch_pc = pc; \
UPDATE_PC_AND_TOS(skip, -2); \
DO_BACKEDGE_CHECKS(skip, branch_pc); \
CONTINUE; \
}
#define NULL_COMPARISON_NOT_OP(name) \
CASE(_if##name): { \
int skip = (!(STACK_OBJECT(-1) == NULL)) \
? (int16_t)Bytes::get_Java_u2(pc + 1) : 3; \
address branch_pc = pc; \
UPDATE_PC_AND_TOS(skip, -1); \
DO_BACKEDGE_CHECKS(skip, branch_pc); \
CONTINUE; \
}
#define NULL_COMPARISON_OP(name) \
CASE(_if##name): { \
int skip = ((STACK_OBJECT(-1) == NULL)) \
? (int16_t)Bytes::get_Java_u2(pc + 1) : 3; \
address branch_pc = pc; \
UPDATE_PC_AND_TOS(skip, -1); \
DO_BACKEDGE_CHECKS(skip, branch_pc); \
CONTINUE; \
}
COMPARISON_OP(lt, <);
COMPARISON_OP(gt, >);
COMPARISON_OP(le, <=);
COMPARISON_OP(ge, >=);
COMPARISON_OP2(eq, ==); /* include ref comparison */
COMPARISON_OP2(ne, !=); /* include ref comparison */
NULL_COMPARISON_OP(null);
NULL_COMPARISON_NOT_OP(nonnull);
/* Goto pc at specified offset in switch table. */
CASE(_tableswitch): {
jint* lpc = (jint*)VMalignWordUp(pc+1);
int32_t key = STACK_INT(-1);
int32_t low = Bytes::get_Java_u4((address)&lpc[1]);
int32_t high = Bytes::get_Java_u4((address)&lpc[2]);
int32_t skip;
key -= low;
skip = ((uint32_t) key > (uint32_t)(high - low))
? Bytes::get_Java_u4((address)&lpc[0])
: Bytes::get_Java_u4((address)&lpc[key + 3]);
// Does this really need a full backedge check (osr?)
address branch_pc = pc;
UPDATE_PC_AND_TOS(skip, -1);
DO_BACKEDGE_CHECKS(skip, branch_pc);
CONTINUE;
}
/* Goto pc whose table entry matches specified key */
CASE(_lookupswitch): {
jint* lpc = (jint*)VMalignWordUp(pc+1);
int32_t key = STACK_INT(-1);
int32_t skip = Bytes::get_Java_u4((address) lpc); /* default amount */
int32_t npairs = Bytes::get_Java_u4((address) &lpc[1]);
while (--npairs >= 0) {
lpc += 2;
if (key == (int32_t)Bytes::get_Java_u4((address)lpc)) {
skip = Bytes::get_Java_u4((address)&lpc[1]);
break;
}
}
address branch_pc = pc;
UPDATE_PC_AND_TOS(skip, -1);
DO_BACKEDGE_CHECKS(skip, branch_pc);
CONTINUE;
}
CASE(_fcmpl):
CASE(_fcmpg):
{
SET_STACK_INT(VMfloatCompare(STACK_FLOAT(-2),
STACK_FLOAT(-1),
(opcode == Bytecodes::_fcmpl ? -1 : 1)),
-2);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -1);
}
CASE(_dcmpl):
CASE(_dcmpg):
{
int r = VMdoubleCompare(STACK_DOUBLE(-3),
STACK_DOUBLE(-1),
(opcode == Bytecodes::_dcmpl ? -1 : 1));
MORE_STACK(-4); // Pop
SET_STACK_INT(r, 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
}
CASE(_lcmp):
{
int r = VMlongCompare(STACK_LONG(-3), STACK_LONG(-1));
MORE_STACK(-4);
SET_STACK_INT(r, 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, 1);
}
/* Return from a method */
CASE(_areturn):
CASE(_ireturn):
CASE(_freturn):
{
// Allow a safepoint before returning to frame manager.
SAFEPOINT;
goto handle_return;
}
CASE(_lreturn):
CASE(_dreturn):
{
// Allow a safepoint before returning to frame manager.
SAFEPOINT;
goto handle_return;
}
CASE(_return_register_finalizer): {
oop rcvr = LOCALS_OBJECT(0);
VERIFY_OOP(rcvr);
if (rcvr->klass()->has_finalizer()) {
CALL_VM(InterpreterRuntime::register_finalizer(THREAD, rcvr), handle_exception);
}
goto handle_return;
}
CASE(_return): {
// Allow a safepoint before returning to frame manager.
SAFEPOINT;
goto handle_return;
}
/* Array access byte-codes */
/* Every array access byte-code starts out like this */
// arrayOopDesc* arrObj = (arrayOopDesc*)STACK_OBJECT(arrayOff);
#define ARRAY_INTRO(arrayOff) \
arrayOop arrObj = (arrayOop)STACK_OBJECT(arrayOff); \
jint index = STACK_INT(arrayOff + 1); \
char message[jintAsStringSize]; \
CHECK_NULL(arrObj); \
if ((uint32_t)index >= (uint32_t)arrObj->length()) { \
sprintf(message, "%d", index); \
VM_JAVA_ERROR(vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), \
message); \
}
/* 32-bit loads. These handle conversion from < 32-bit types */
#define ARRAY_LOADTO32(T, T2, format, stackRes, extra) \
{ \
ARRAY_INTRO(-2); \
(void)extra; \
SET_ ## stackRes(*(T2 *)(((address) arrObj->base(T)) + index * sizeof(T2)), \
-2); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -1); \
}
/* 64-bit loads */
#define ARRAY_LOADTO64(T,T2, stackRes, extra) \
{ \
ARRAY_INTRO(-2); \
SET_ ## stackRes(*(T2 *)(((address) arrObj->base(T)) + index * sizeof(T2)), -1); \
(void)extra; \
UPDATE_PC_AND_CONTINUE(1); \
}
CASE(_iaload):
ARRAY_LOADTO32(T_INT, jint, "%d", STACK_INT, 0);
CASE(_faload):
ARRAY_LOADTO32(T_FLOAT, jfloat, "%f", STACK_FLOAT, 0);
CASE(_aaload):
ARRAY_LOADTO32(T_OBJECT, oop, INTPTR_FORMAT, STACK_OBJECT, 0);
CASE(_baload):
ARRAY_LOADTO32(T_BYTE, jbyte, "%d", STACK_INT, 0);
CASE(_caload):
ARRAY_LOADTO32(T_CHAR, jchar, "%d", STACK_INT, 0);
CASE(_saload):
ARRAY_LOADTO32(T_SHORT, jshort, "%d", STACK_INT, 0);
CASE(_laload):
ARRAY_LOADTO64(T_LONG, jlong, STACK_LONG, 0);
CASE(_daload):
ARRAY_LOADTO64(T_DOUBLE, jdouble, STACK_DOUBLE, 0);
/* 32-bit stores. These handle conversion to < 32-bit types */
#define ARRAY_STOREFROM32(T, T2, format, stackSrc, extra) \
{ \
ARRAY_INTRO(-3); \
(void)extra; \
*(T2 *)(((address) arrObj->base(T)) + index * sizeof(T2)) = stackSrc( -1); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -3); \
}
/* 64-bit stores */
#define ARRAY_STOREFROM64(T, T2, stackSrc, extra) \
{ \
ARRAY_INTRO(-4); \
(void)extra; \
*(T2 *)(((address) arrObj->base(T)) + index * sizeof(T2)) = stackSrc( -1); \
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -4); \
}
CASE(_iastore):
ARRAY_STOREFROM32(T_INT, jint, "%d", STACK_INT, 0);
CASE(_fastore):
ARRAY_STOREFROM32(T_FLOAT, jfloat, "%f", STACK_FLOAT, 0);
/*
* This one looks different because of the assignability check
*/
CASE(_aastore): {
oop rhsObject = STACK_OBJECT(-1);
VERIFY_OOP(rhsObject);
ARRAY_INTRO( -3);
// arrObj, index are set
if (rhsObject != NULL) {
/* Check assignability of rhsObject into arrObj */
Klass* rhsKlassOop = rhsObject->klass(); // EBX (subclass)
Klass* elemKlassOop = ObjArrayKlass::cast(arrObj->klass())->element_klass(); // superklass EAX
//
// Check for compatibilty. This check must not GC!!
// Seems way more expensive now that we must dispatch
//
if (rhsKlassOop != elemKlassOop && !rhsKlassOop->is_subtype_of(elemKlassOop)) { // ebx->is...
VM_JAVA_ERROR(vmSymbols::java_lang_ArrayStoreException(), "");
}
}
oop* elem_loc = (oop*)(((address) arrObj->base(T_OBJECT)) + index * sizeof(oop));
// *(oop*)(((address) arrObj->base(T_OBJECT)) + index * sizeof(oop)) = rhsObject;
*elem_loc = rhsObject;
// Mark the card
OrderAccess::release_store(&BYTE_MAP_BASE[(uintptr_t)elem_loc >> CardTableModRefBS::card_shift], 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -3);
}
CASE(_bastore):
ARRAY_STOREFROM32(T_BYTE, jbyte, "%d", STACK_INT, 0);
CASE(_castore):
ARRAY_STOREFROM32(T_CHAR, jchar, "%d", STACK_INT, 0);
CASE(_sastore):
ARRAY_STOREFROM32(T_SHORT, jshort, "%d", STACK_INT, 0);
CASE(_lastore):
ARRAY_STOREFROM64(T_LONG, jlong, STACK_LONG, 0);
CASE(_dastore):
ARRAY_STOREFROM64(T_DOUBLE, jdouble, STACK_DOUBLE, 0);
CASE(_arraylength):
{
arrayOop ary = (arrayOop) STACK_OBJECT(-1);
CHECK_NULL(ary);
SET_STACK_INT(ary->length(), -1);
UPDATE_PC_AND_CONTINUE(1);
}
/* monitorenter and monitorexit for locking/unlocking an object */
CASE(_monitorenter): {
oop lockee = STACK_OBJECT(-1);
// derefing's lockee ought to provoke implicit null check
CHECK_NULL(lockee);
// find a free monitor or one already allocated for this object
// if we find a matching object then we need a new monitor
// since this is recursive enter
BasicObjectLock* limit = istate->monitor_base();
BasicObjectLock* most_recent = (BasicObjectLock*) istate->stack_base();
BasicObjectLock* entry = NULL;
while (most_recent != limit ) {
if (most_recent->obj() == NULL) entry = most_recent;
else if (most_recent->obj() == lockee) break;
most_recent++;
}
if (entry != NULL) {
entry->set_obj(lockee);
markOop displaced = lockee->mark()->set_unlocked();
entry->lock()->set_displaced_header(displaced);
if (Atomic::cmpxchg_ptr(entry, lockee->mark_addr(), displaced) != displaced) {
// Is it simple recursive case?
if (THREAD->is_lock_owned((address) displaced->clear_lock_bits())) {
entry->lock()->set_displaced_header(NULL);
} else {
CALL_VM(InterpreterRuntime::monitorenter(THREAD, entry), handle_exception);
}
}
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -1);
} else {
istate->set_msg(more_monitors);
UPDATE_PC_AND_RETURN(0); // Re-execute
}
}
CASE(_monitorexit): {
oop lockee = STACK_OBJECT(-1);
CHECK_NULL(lockee);
// derefing's lockee ought to provoke implicit null check
// find our monitor slot
BasicObjectLock* limit = istate->monitor_base();
BasicObjectLock* most_recent = (BasicObjectLock*) istate->stack_base();
while (most_recent != limit ) {
if ((most_recent)->obj() == lockee) {
BasicLock* lock = most_recent->lock();
markOop header = lock->displaced_header();
most_recent->set_obj(NULL);
// If it isn't recursive we either must swap old header or call the runtime
if (header != NULL) {
if (Atomic::cmpxchg_ptr(header, lockee->mark_addr(), lock) != lock) {
// restore object for the slow case
most_recent->set_obj(lockee);
CALL_VM(InterpreterRuntime::monitorexit(THREAD, most_recent), handle_exception);
}
}
UPDATE_PC_AND_TOS_AND_CONTINUE(1, -1);
}
most_recent++;
}
// Need to throw illegal monitor state exception
CALL_VM(InterpreterRuntime::throw_illegal_monitor_state_exception(THREAD), handle_exception);
ShouldNotReachHere();
}
/* All of the non-quick opcodes. */
/* -Set clobbersCpIndex true if the quickened opcode clobbers the
* constant pool index in the instruction.
*/
CASE(_getfield):
CASE(_getstatic):
{
u2 index;
ConstantPoolCacheEntry* cache;
index = Bytes::get_native_u2(pc+1);
// QQQ Need to make this as inlined as possible. Probably need to
// split all the bytecode cases out so c++ compiler has a chance
// for constant prop to fold everything possible away.
cache = cp->entry_at(index);
if (!cache->is_resolved((Bytecodes::Code)opcode)) {
CALL_VM(InterpreterRuntime::resolve_get_put(THREAD, (Bytecodes::Code)opcode),
handle_exception);
cache = cp->entry_at(index);
}
#ifdef VM_JVMTI
if (_jvmti_interp_events) {
int *count_addr;
oop obj;
// Check to see if a field modification watch has been set
// before we take the time to call into the VM.
count_addr = (int *)JvmtiExport::get_field_access_count_addr();
if ( *count_addr > 0 ) {
if ((Bytecodes::Code)opcode == Bytecodes::_getstatic) {
obj = (oop)NULL;
} else {
obj = (oop) STACK_OBJECT(-1);
VERIFY_OOP(obj);
}
CALL_VM(InterpreterRuntime::post_field_access(THREAD,
obj,
cache),
handle_exception);
}
}
#endif /* VM_JVMTI */
oop obj;
if ((Bytecodes::Code)opcode == Bytecodes::_getstatic) {
Klass* k = cache->f1_as_klass();
obj = k->java_mirror();
MORE_STACK(1); // Assume single slot push
} else {
obj = (oop) STACK_OBJECT(-1);
CHECK_NULL(obj);
}
//
// Now store the result on the stack
//
TosState tos_type = cache->flag_state();
int field_offset = cache->f2_as_index();
if (cache->is_volatile()) {
if (tos_type == atos) {
VERIFY_OOP(obj->obj_field_acquire(field_offset));
SET_STACK_OBJECT(obj->obj_field_acquire(field_offset), -1);
} else if (tos_type == itos) {
SET_STACK_INT(obj->int_field_acquire(field_offset), -1);
} else if (tos_type == ltos) {
SET_STACK_LONG(obj->long_field_acquire(field_offset), 0);
MORE_STACK(1);
} else if (tos_type == btos) {
SET_STACK_INT(obj->byte_field_acquire(field_offset), -1);
} else if (tos_type == ctos) {
SET_STACK_INT(obj->char_field_acquire(field_offset), -1);
} else if (tos_type == stos) {
SET_STACK_INT(obj->short_field_acquire(field_offset), -1);
} else if (tos_type == ftos) {
SET_STACK_FLOAT(obj->float_field_acquire(field_offset), -1);
} else {
SET_STACK_DOUBLE(obj->double_field_acquire(field_offset), 0);
MORE_STACK(1);
}
} else {
if (tos_type == atos) {
VERIFY_OOP(obj->obj_field(field_offset));
SET_STACK_OBJECT(obj->obj_field(field_offset), -1);
} else if (tos_type == itos) {
SET_STACK_INT(obj->int_field(field_offset), -1);
} else if (tos_type == ltos) {
SET_STACK_LONG(obj->long_field(field_offset), 0);
MORE_STACK(1);
} else if (tos_type == btos) {
SET_STACK_INT(obj->byte_field(field_offset), -1);
} else if (tos_type == ctos) {
SET_STACK_INT(obj->char_field(field_offset), -1);
} else if (tos_type == stos) {
SET_STACK_INT(obj->short_field(field_offset), -1);
} else if (tos_type == ftos) {
SET_STACK_FLOAT(obj->float_field(field_offset), -1);
} else {
SET_STACK_DOUBLE(obj->double_field(field_offset), 0);
MORE_STACK(1);
}
}
UPDATE_PC_AND_CONTINUE(3);
}
CASE(_putfield):
CASE(_putstatic):
{
u2 index = Bytes::get_native_u2(pc+1);
ConstantPoolCacheEntry* cache = cp->entry_at(index);
if (!cache->is_resolved((Bytecodes::Code)opcode)) {
CALL_VM(InterpreterRuntime::resolve_get_put(THREAD, (Bytecodes::Code)opcode),
handle_exception);
cache = cp->entry_at(index);
}
#ifdef VM_JVMTI
if (_jvmti_interp_events) {
int *count_addr;
oop obj;
// Check to see if a field modification watch has been set
// before we take the time to call into the VM.
count_addr = (int *)JvmtiExport::get_field_modification_count_addr();
if ( *count_addr > 0 ) {
if ((Bytecodes::Code)opcode == Bytecodes::_putstatic) {
obj = (oop)NULL;
}
else {
if (cache->is_long() || cache->is_double()) {
obj = (oop) STACK_OBJECT(-3);
} else {
obj = (oop) STACK_OBJECT(-2);
}
VERIFY_OOP(obj);
}
CALL_VM(InterpreterRuntime::post_field_modification(THREAD,
obj,
cache,
(jvalue *)STACK_SLOT(-1)),
handle_exception);
}
}
#endif /* VM_JVMTI */
// QQQ Need to make this as inlined as possible. Probably need to split all the bytecode cases
// out so c++ compiler has a chance for constant prop to fold everything possible away.
oop obj;
int count;
TosState tos_type = cache->flag_state();
count = -1;
if (tos_type == ltos || tos_type == dtos) {
--count;
}
if ((Bytecodes::Code)opcode == Bytecodes::_putstatic) {
Klass* k = cache->f1_as_klass();
obj = k->java_mirror();
} else {
--count;
obj = (oop) STACK_OBJECT(count);
CHECK_NULL(obj);
}
//
// Now store the result
//
int field_offset = cache->f2_as_index();
if (cache->is_volatile()) {
if (tos_type == itos) {
obj->release_int_field_put(field_offset, STACK_INT(-1));
} else if (tos_type == atos) {
VERIFY_OOP(STACK_OBJECT(-1));
obj->release_obj_field_put(field_offset, STACK_OBJECT(-1));
OrderAccess::release_store(&BYTE_MAP_BASE[(uintptr_t)obj >> CardTableModRefBS::card_shift], 0);
} else if (tos_type == btos) {
obj->release_byte_field_put(field_offset, STACK_INT(-1));
} else if (tos_type == ltos) {
obj->release_long_field_put(field_offset, STACK_LONG(-1));
} else if (tos_type == ctos) {
obj->release_char_field_put(field_offset, STACK_INT(-1));
} else if (tos_type == stos) {
obj->release_short_field_put(field_offset, STACK_INT(-1));
} else if (tos_type == ftos) {
obj->release_float_field_put(field_offset, STACK_FLOAT(-1));
} else {
obj->release_double_field_put(field_offset, STACK_DOUBLE(-1));
}
OrderAccess::storeload();
} else {
if (tos_type == itos) {
obj->int_field_put(field_offset, STACK_INT(-1));
} else if (tos_type == atos) {
VERIFY_OOP(STACK_OBJECT(-1));
obj->obj_field_put(field_offset, STACK_OBJECT(-1));
OrderAccess::release_store(&BYTE_MAP_BASE[(uintptr_t)obj >> CardTableModRefBS::card_shift], 0);
} else if (tos_type == btos) {
obj->byte_field_put(field_offset, STACK_INT(-1));
} else if (tos_type == ltos) {
obj->long_field_put(field_offset, STACK_LONG(-1));
} else if (tos_type == ctos) {
obj->char_field_put(field_offset, STACK_INT(-1));
} else if (tos_type == stos) {
obj->short_field_put(field_offset, STACK_INT(-1));
} else if (tos_type == ftos) {
obj->float_field_put(field_offset, STACK_FLOAT(-1));
} else {
obj->double_field_put(field_offset, STACK_DOUBLE(-1));
}
}
UPDATE_PC_AND_TOS_AND_CONTINUE(3, count);
}
CASE(_new): {
u2 index = Bytes::get_Java_u2(pc+1);
ConstantPool* constants = istate->method()->constants();
if (!constants->tag_at(index).is_unresolved_klass()) {
// Make sure klass is initialized and doesn't have a finalizer
Klass* entry = constants->slot_at(index).get_klass();
assert(entry->is_klass(), "Should be resolved klass");
Klass* k_entry = (Klass*) entry;
assert(k_entry->oop_is_instance(), "Should be InstanceKlass");
InstanceKlass* ik = (InstanceKlass*) k_entry;
if ( ik->is_initialized() && ik->can_be_fastpath_allocated() ) {
size_t obj_size = ik->size_helper();
oop result = NULL;
// If the TLAB isn't pre-zeroed then we'll have to do it
bool need_zero = !ZeroTLAB;
if (UseTLAB) {
result = (oop) THREAD->tlab().allocate(obj_size);
}
if (result == NULL) {
need_zero = true;
// Try allocate in shared eden
retry:
HeapWord* compare_to = *Universe::heap()->top_addr();
HeapWord* new_top = compare_to + obj_size;
if (new_top <= *Universe::heap()->end_addr()) {
if (Atomic::cmpxchg_ptr(new_top, Universe::heap()->top_addr(), compare_to) != compare_to) {
goto retry;
}
result = (oop) compare_to;
}
}
if (result != NULL) {
// Initialize object (if nonzero size and need) and then the header
if (need_zero ) {
HeapWord* to_zero = (HeapWord*) result + sizeof(oopDesc) / oopSize;
obj_size -= sizeof(oopDesc) / oopSize;
if (obj_size > 0 ) {
memset(to_zero, 0, obj_size * HeapWordSize);
}
}
if (UseBiasedLocking) {
result->set_mark(ik->prototype_header());
} else {
result->set_mark(markOopDesc::prototype());
}
result->set_klass_gap(0);
result->set_klass(k_entry);
SET_STACK_OBJECT(result, 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(3, 1);
}
}
}
// Slow case allocation
CALL_VM(InterpreterRuntime::_new(THREAD, METHOD->constants(), index),
handle_exception);
SET_STACK_OBJECT(THREAD->vm_result(), 0);
THREAD->set_vm_result(NULL);
UPDATE_PC_AND_TOS_AND_CONTINUE(3, 1);
}
CASE(_anewarray): {
u2 index = Bytes::get_Java_u2(pc+1);
jint size = STACK_INT(-1);
CALL_VM(InterpreterRuntime::anewarray(THREAD, METHOD->constants(), index, size),
handle_exception);
SET_STACK_OBJECT(THREAD->vm_result(), -1);
THREAD->set_vm_result(NULL);
UPDATE_PC_AND_CONTINUE(3);
}
CASE(_multianewarray): {
jint dims = *(pc+3);
jint size = STACK_INT(-1);
// stack grows down, dimensions are up!
jint *dimarray =
(jint*)&topOfStack[dims * Interpreter::stackElementWords+
Interpreter::stackElementWords-1];
//adjust pointer to start of stack element
CALL_VM(InterpreterRuntime::multianewarray(THREAD, dimarray),
handle_exception);
SET_STACK_OBJECT(THREAD->vm_result(), -dims);
THREAD->set_vm_result(NULL);
UPDATE_PC_AND_TOS_AND_CONTINUE(4, -(dims-1));
}
CASE(_checkcast):
if (STACK_OBJECT(-1) != NULL) {
VERIFY_OOP(STACK_OBJECT(-1));
u2 index = Bytes::get_Java_u2(pc+1);
if (ProfileInterpreter) {
// needs Profile_checkcast QQQ
ShouldNotReachHere();
}
// Constant pool may have actual klass or unresolved klass. If it is
// unresolved we must resolve it
if (METHOD->constants()->tag_at(index).is_unresolved_klass()) {
CALL_VM(InterpreterRuntime::quicken_io_cc(THREAD), handle_exception);
}
Klass* klassOf = (Klass*) METHOD->constants()->slot_at(index).get_klass();
Klass* objKlassOop = STACK_OBJECT(-1)->klass(); //ebx
//
// Check for compatibilty. This check must not GC!!
// Seems way more expensive now that we must dispatch
//
if (objKlassOop != klassOf &&
!objKlassOop->is_subtype_of(klassOf)) {
ResourceMark rm(THREAD);
const char* objName = objKlassOop->external_name();
const char* klassName = klassOf->external_name();
char* message = SharedRuntime::generate_class_cast_message(
objName, klassName);
VM_JAVA_ERROR(vmSymbols::java_lang_ClassCastException(), message);
}
} else {
if (UncommonNullCast) {
// istate->method()->set_null_cast_seen();
// [RGV] Not sure what to do here!
}
}
UPDATE_PC_AND_CONTINUE(3);
CASE(_instanceof):
if (STACK_OBJECT(-1) == NULL) {
SET_STACK_INT(0, -1);
} else {
VERIFY_OOP(STACK_OBJECT(-1));
u2 index = Bytes::get_Java_u2(pc+1);
// Constant pool may have actual klass or unresolved klass. If it is
// unresolved we must resolve it
if (METHOD->constants()->tag_at(index).is_unresolved_klass()) {
CALL_VM(InterpreterRuntime::quicken_io_cc(THREAD), handle_exception);
}
Klass* klassOf = (Klass*) METHOD->constants()->slot_at(index).get_klass();
Klass* objKlassOop = STACK_OBJECT(-1)->klass();
//
// Check for compatibilty. This check must not GC!!
// Seems way more expensive now that we must dispatch
//
if ( objKlassOop == klassOf || objKlassOop->is_subtype_of(klassOf)) {
SET_STACK_INT(1, -1);
} else {
SET_STACK_INT(0, -1);
}
}
UPDATE_PC_AND_CONTINUE(3);
CASE(_ldc_w):
CASE(_ldc):
{
u2 index;
bool wide = false;
int incr = 2; // frequent case
if (opcode == Bytecodes::_ldc) {
index = pc[1];
} else {
index = Bytes::get_Java_u2(pc+1);
incr = 3;
wide = true;
}
ConstantPool* constants = METHOD->constants();
switch (constants->tag_at(index).value()) {
case JVM_CONSTANT_Integer:
SET_STACK_INT(constants->int_at(index), 0);
break;
case JVM_CONSTANT_Float:
SET_STACK_FLOAT(constants->float_at(index), 0);
break;
case JVM_CONSTANT_String:
{
oop result = constants->resolved_references()->obj_at(index);
if (result == NULL) {
CALL_VM(InterpreterRuntime::resolve_ldc(THREAD, (Bytecodes::Code) opcode), handle_exception);
SET_STACK_OBJECT(THREAD->vm_result(), 0);
THREAD->set_vm_result(NULL);
} else {
VERIFY_OOP(result);
SET_STACK_OBJECT(result, 0);
}
break;
}
case JVM_CONSTANT_Class:
VERIFY_OOP(constants->resolved_klass_at(index)->java_mirror());
SET_STACK_OBJECT(constants->resolved_klass_at(index)->java_mirror(), 0);
break;
case JVM_CONSTANT_UnresolvedClass:
case JVM_CONSTANT_UnresolvedClassInError:
CALL_VM(InterpreterRuntime::ldc(THREAD, wide), handle_exception);
SET_STACK_OBJECT(THREAD->vm_result(), 0);
THREAD->set_vm_result(NULL);
break;
default: ShouldNotReachHere();
}
UPDATE_PC_AND_TOS_AND_CONTINUE(incr, 1);
}
CASE(_ldc2_w):
{
u2 index = Bytes::get_Java_u2(pc+1);
ConstantPool* constants = METHOD->constants();
switch (constants->tag_at(index).value()) {
case JVM_CONSTANT_Long:
SET_STACK_LONG(constants->long_at(index), 1);
break;
case JVM_CONSTANT_Double:
SET_STACK_DOUBLE(constants->double_at(index), 1);
break;
default: ShouldNotReachHere();
}
UPDATE_PC_AND_TOS_AND_CONTINUE(3, 2);
}
CASE(_fast_aldc_w):
CASE(_fast_aldc): {
u2 index;
int incr;
if (opcode == Bytecodes::_fast_aldc) {
index = pc[1];
incr = 2;
} else {
index = Bytes::get_native_u2(pc+1);
incr = 3;
}
// We are resolved if the f1 field contains a non-null object (CallSite, etc.)
// This kind of CP cache entry does not need to match the flags byte, because
// there is a 1-1 relation between bytecode type and CP entry type.
ConstantPool* constants = METHOD->constants();
oop result = constants->resolved_references()->obj_at(index);
if (result == NULL) {
CALL_VM(InterpreterRuntime::resolve_ldc(THREAD, (Bytecodes::Code) opcode),
handle_exception);
result = THREAD->vm_result();
}
VERIFY_OOP(result);
SET_STACK_OBJECT(result, 0);
UPDATE_PC_AND_TOS_AND_CONTINUE(incr, 1);
}
CASE(_invokedynamic): {
if (!EnableInvokeDynamic) {
// We should not encounter this bytecode if !EnableInvokeDynamic.
// The verifier will stop it. However, if we get past the verifier,
// this will stop the thread in a reasonable way, without crashing the JVM.
CALL_VM(InterpreterRuntime::throw_IncompatibleClassChangeError(THREAD),
handle_exception);
ShouldNotReachHere();
}
u4 index = Bytes::get_native_u4(pc+1);
ConstantPoolCacheEntry* cache = cp->constant_pool()->invokedynamic_cp_cache_entry_at(index);
// We are resolved if the resolved_references field contains a non-null object (CallSite, etc.)
// This kind of CP cache entry does not need to match the flags byte, because
// there is a 1-1 relation between bytecode type and CP entry type.
if (! cache->is_resolved((Bytecodes::Code) opcode)) {
CALL_VM(InterpreterRuntime::resolve_invokedynamic(THREAD),
handle_exception);
cache = cp->constant_pool()->invokedynamic_cp_cache_entry_at(index);
}
Method* method = cache->f1_as_method();
if (VerifyOops) method->verify();
if (cache->has_appendix()) {
ConstantPool* constants = METHOD->constants();
SET_STACK_OBJECT(cache->appendix_if_resolved(constants), 0);
MORE_STACK(1);
}
istate->set_msg(call_method);
istate->set_callee(method);
istate->set_callee_entry_point(method->from_interpreted_entry());
istate->set_bcp_advance(5);
UPDATE_PC_AND_RETURN(0); // I'll be back...
}
CASE(_invokehandle): {
if (!EnableInvokeDynamic) {
ShouldNotReachHere();
}
u2 index = Bytes::get_native_u2(pc+1);
ConstantPoolCacheEntry* cache = cp->entry_at(index);
if (! cache->is_resolved((Bytecodes::Code) opcode)) {
CALL_VM(InterpreterRuntime::resolve_invokehandle(THREAD),
handle_exception);
cache = cp->entry_at(index);
}
Method* method = cache->f1_as_method();
if (VerifyOops) method->verify();
if (cache->has_appendix()) {
ConstantPool* constants = METHOD->constants();
SET_STACK_OBJECT(cache->appendix_if_resolved(constants), 0);
MORE_STACK(1);
}
istate->set_msg(call_method);
istate->set_callee(method);
istate->set_callee_entry_point(method->from_interpreted_entry());
istate->set_bcp_advance(3);
UPDATE_PC_AND_RETURN(0); // I'll be back...
}
CASE(_invokeinterface): {
u2 index = Bytes::get_native_u2(pc+1);
// QQQ Need to make this as inlined as possible. Probably need to split all the bytecode cases
// out so c++ compiler has a chance for constant prop to fold everything possible away.
ConstantPoolCacheEntry* cache = cp->entry_at(index);
if (!cache->is_resolved((Bytecodes::Code)opcode)) {
CALL_VM(InterpreterRuntime::resolve_invoke(THREAD, (Bytecodes::Code)opcode),
handle_exception);
cache = cp->entry_at(index);
}
istate->set_msg(call_method);
// Special case of invokeinterface called for virtual method of
// java.lang.Object. See cpCacheOop.cpp for details.
// This code isn't produced by javac, but could be produced by
// another compliant java compiler.
if (cache->is_forced_virtual()) {
Method* callee;
CHECK_NULL(STACK_OBJECT(-(cache->parameter_size())));
if (cache->is_vfinal()) {
callee = cache->f2_as_vfinal_method();
} else {
// get receiver
int parms = cache->parameter_size();
// Same comments as invokevirtual apply here
VERIFY_OOP(STACK_OBJECT(-parms));
InstanceKlass* rcvrKlass = (InstanceKlass*)
STACK_OBJECT(-parms)->klass();
callee = (Method*) rcvrKlass->start_of_vtable()[ cache->f2_as_index()];
}
istate->set_callee(callee);
istate->set_callee_entry_point(callee->from_interpreted_entry());
#ifdef VM_JVMTI
if (JvmtiExport::can_post_interpreter_events() && THREAD->is_interp_only_mode()) {
istate->set_callee_entry_point(callee->interpreter_entry());
}
#endif /* VM_JVMTI */
istate->set_bcp_advance(5);
UPDATE_PC_AND_RETURN(0); // I'll be back...
}
// this could definitely be cleaned up QQQ
Method* callee;
Klass* iclass = cache->f1_as_klass();
// InstanceKlass* interface = (InstanceKlass*) iclass;
// get receiver
int parms = cache->parameter_size();
oop rcvr = STACK_OBJECT(-parms);
CHECK_NULL(rcvr);
InstanceKlass* int2 = (InstanceKlass*) rcvr->klass();
itableOffsetEntry* ki = (itableOffsetEntry*) int2->start_of_itable();
int i;
for ( i = 0 ; i < int2->itable_length() ; i++, ki++ ) {
if (ki->interface_klass() == iclass) break;
}
// If the interface isn't found, this class doesn't implement this
// interface. The link resolver checks this but only for the first
// time this interface is called.
if (i == int2->itable_length()) {
VM_JAVA_ERROR(vmSymbols::java_lang_IncompatibleClassChangeError(), "");
}
int mindex = cache->f2_as_index();
itableMethodEntry* im = ki->first_method_entry(rcvr->klass());
callee = im[mindex].method();
if (callee == NULL) {
VM_JAVA_ERROR(vmSymbols::java_lang_AbstractMethodError(), "");
}
istate->set_callee(callee);
istate->set_callee_entry_point(callee->from_interpreted_entry());
#ifdef VM_JVMTI
if (JvmtiExport::can_post_interpreter_events() && THREAD->is_interp_only_mode()) {
istate->set_callee_entry_point(callee->interpreter_entry());
}
#endif /* VM_JVMTI */
istate->set_bcp_advance(5);
UPDATE_PC_AND_RETURN(0); // I'll be back...
}
CASE(_invokevirtual):
CASE(_invokespecial):
CASE(_invokestatic): {
u2 index = Bytes::get_native_u2(pc+1);
ConstantPoolCacheEntry* cache = cp->entry_at(index);
// QQQ Need to make this as inlined as possible. Probably need to split all the bytecode cases
// out so c++ compiler has a chance for constant prop to fold everything possible away.
if (!cache->is_resolved((Bytecodes::Code)opcode)) {
CALL_VM(InterpreterRuntime::resolve_invoke(THREAD, (Bytecodes::Code)opcode),
handle_exception);
cache = cp->entry_at(index);
}
istate->set_msg(call_method);
{
Method* callee;
if ((Bytecodes::Code)opcode == Bytecodes::_invokevirtual) {
CHECK_NULL(STACK_OBJECT(-(cache->parameter_size())));
if (cache->is_vfinal()) callee = cache->f2_as_vfinal_method();
else {
// get receiver
int parms = cache->parameter_size();
// this works but needs a resourcemark and seems to create a vtable on every call:
// Method* callee = rcvr->klass()->vtable()->method_at(cache->f2_as_index());
//
// this fails with an assert
// InstanceKlass* rcvrKlass = InstanceKlass::cast(STACK_OBJECT(-parms)->klass());
// but this works
VERIFY_OOP(STACK_OBJECT(-parms));
InstanceKlass* rcvrKlass = (InstanceKlass*) STACK_OBJECT(-parms)->klass();
/*
Executing this code in java.lang.String:
public String(char value[]) {
this.count = value.length;
this.value = (char[])value.clone();
}
a find on rcvr->klass() reports:
{type array char}{type array class}
- klass: {other class}
but using InstanceKlass::cast(STACK_OBJECT(-parms)->klass()) causes in assertion failure
because rcvr->klass()->oop_is_instance() == 0
However it seems to have a vtable in the right location. Huh?
*/
callee = (Method*) rcvrKlass->start_of_vtable()[ cache->f2_as_index()];
}
} else {
if ((Bytecodes::Code)opcode == Bytecodes::_invokespecial) {
CHECK_NULL(STACK_OBJECT(-(cache->parameter_size())));
}
callee = cache->f1_as_method();
}
istate->set_callee(callee);
istate->set_callee_entry_point(callee->from_interpreted_entry());
#ifdef VM_JVMTI
if (JvmtiExport::can_post_interpreter_events() && THREAD->is_interp_only_mode()) {
istate->set_callee_entry_point(callee->interpreter_entry());
}
#endif /* VM_JVMTI */
istate->set_bcp_advance(3);
UPDATE_PC_AND_RETURN(0); // I'll be back...
}
}
/* Allocate memory for a new java object. */
CASE(_newarray): {
BasicType atype = (BasicType) *(pc+1);
jint size = STACK_INT(-1);
CALL_VM(InterpreterRuntime::newarray(THREAD, atype, size),
handle_exception);
SET_STACK_OBJECT(THREAD->vm_result(), -1);
THREAD->set_vm_result(NULL);
UPDATE_PC_AND_CONTINUE(2);
}
/* Throw an exception. */
CASE(_athrow): {
oop except_oop = STACK_OBJECT(-1);
CHECK_NULL(except_oop);
// set pending_exception so we use common code
THREAD->set_pending_exception(except_oop, NULL, 0);
goto handle_exception;
}
/* goto and jsr. They are exactly the same except jsr pushes
* the address of the next instruction first.
*/
CASE(_jsr): {
/* push bytecode index on stack */
SET_STACK_ADDR(((address)pc - (intptr_t)(istate->method()->code_base()) + 3), 0);
MORE_STACK(1);
/* FALL THROUGH */
}
CASE(_goto):
{
int16_t offset = (int16_t)Bytes::get_Java_u2(pc + 1);
address branch_pc = pc;
UPDATE_PC(offset);
DO_BACKEDGE_CHECKS(offset, branch_pc);
CONTINUE;
}
CASE(_jsr_w): {
/* push return address on the stack */
SET_STACK_ADDR(((address)pc - (intptr_t)(istate->method()->code_base()) + 5), 0);
MORE_STACK(1);
/* FALL THROUGH */
}
CASE(_goto_w):
{
int32_t offset = Bytes::get_Java_u4(pc + 1);
address branch_pc = pc;
UPDATE_PC(offset);
DO_BACKEDGE_CHECKS(offset, branch_pc);
CONTINUE;
}
/* return from a jsr or jsr_w */
CASE(_ret): {
pc = istate->method()->code_base() + (intptr_t)(LOCALS_ADDR(pc[1]));
UPDATE_PC_AND_CONTINUE(0);
}
/* debugger breakpoint */
CASE(_breakpoint): {
Bytecodes::Code original_bytecode;
DECACHE_STATE();
SET_LAST_JAVA_FRAME();
original_bytecode = InterpreterRuntime::get_original_bytecode_at(THREAD,
METHOD, pc);
RESET_LAST_JAVA_FRAME();
CACHE_STATE();
if (THREAD->has_pending_exception()) goto handle_exception;
CALL_VM(InterpreterRuntime::_breakpoint(THREAD, METHOD, pc),
handle_exception);
opcode = (jubyte)original_bytecode;
goto opcode_switch;
}
DEFAULT:
fatal(err_msg("Unimplemented opcode %d = %s", opcode,
Bytecodes::name((Bytecodes::Code)opcode)));
goto finish;
} /* switch(opc) */
#ifdef USELABELS
check_for_exception:
#endif
{
if (!THREAD->has_pending_exception()) {
CONTINUE;
}
/* We will be gcsafe soon, so flush our state. */
DECACHE_PC();
goto handle_exception;
}
do_continue: ;
} /* while (1) interpreter loop */
可以看到，opcode 就是字节码指令中的操作数，根据操作码的不同，case 会进行匹配，调用对应的执行方法。
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